Researchers find unusual phenomenon in clouds triggers lightning flash
As the professor quoted below says: “Despite over 250 years of research, how lightning begins is still a mystery.” Tesla had a few ideas though (video).
In a first-of-its-kind observation, researchers from the University of New Hampshire Space Science Center have documented a unique event that occurs in clouds before a lightning flash happens, says Phys.org.
Their observation, called “fast negative breakdown,” documents a new possible way for lightning to form and is the opposite of the current scientific view of how air carries electricity in thunderstorms.
“This is the first time fast negative breakdown has ever been observed, so it’s very exciting,” said Ningyu Liu, professor of physics. “Despite over 250 years of research, how lightning begins is still a mystery. The process was totally unexpected and gives us more insight into how lightning starts and spreads.”
Their finding, published in the journal Nature Communications, is another step toward answering the question of how lightning begins.
Recently, the problem of lightning initiation seemed to be solved with the discovery of “fast positive breakdown” of air, which matched the theory long held by lightning researchers.
Fast positive breakdown involves the downward development of a pathway in the cloud, moving from the positive charge at the top of the cloud to the negative charge in the middle of the cloud. The pathway forms at one-fifth the speed of light and can trigger lightning.
However, the newly reported observation of fast negative breakdown shows that an upward pathway—going in the opposite direction and just as fast—can be created in a thundercloud, indicating there’s another way to start electricity in the air.
Ultimately, this provides scientists with a new view of what’s possible inside a storm cloud.
“These findings indicate that lightning creation within a cloud might be more bi-directional than we originally thought,” said Julia Tilles, a doctoral candidate in the UNH Space Science Center.
Full report here
Source: https://tallbloke.wordpress.com/2019/04/11/researchers-find-unusual-phenomenon-in-clouds-triggers-lightning-flash/
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